On 08/30/2015 05:07 AM, Mauro Carvalho Chehab wrote: > au0828_analog_unregister() calls video_unregister_device(), > with, in turn, calls media_devnode_remove() in order to drop > the media interfaces. > > We can't release the media controller before that, or an > OOPS will occur: So this patch should be moved to a place earlier in the patch series, right? To prevent bisects that hit this bug. Regards, Hans > > [ 176.938752] usb 1-4.4: Media device released > [ 176.938753] usb 1-4.4: Media device unregistered > [ 177.091235] general protection fault: 0000 [#1] SMP > [ 177.091253] Modules linked in: ir_lirc_codec ir_xmp_decoder lirc_dev ir_mce_kbd_decoder ir_sharp_decoder ir_sanyo_decoder ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_nec_decoder ir_rc5_decoder au8522_dig xc5000 tuner au8522_decoder au8522_common au0828(-) videobuf2_vmalloc videobuf2_memops tveeprom videobuf2_core dvb_core rc_core v4l2_common videodev media cpufreq_powersave cpufreq_conservative cpufreq_userspace cpufreq_stats parport_pc ppdev lp parport snd_hda_codec_hdmi i915 x86_pkg_temp_thermal intel_powerclamp intel_rapl iosf_mbi coretemp kvm_intel kvm btusb crct10dif_pclmul snd_hda_codec_realtek crc32_pclmul btrtl crc32c_intel btbcm snd_hda_codec_generic ghash_clmulni_intel btintel i2c_algo_bit drm_kms_helper bluetooth iTCO_wdt snd_usb_audio snd_hda_intel iTCO_vendor_support jitterentropy_rng > [ 177.091455] snd_hda_codec evdev sha256_ssse3 drm sha256_generic hmac snd_usbmidi_lib snd_hwdep snd_hda_core snd_rawmidi drbg snd_seq_device snd_pcm aesni_intel aes_x86_64 lrw gf128mul mei_me glue_helper snd_timer ablk_helper cryptd mei rfkill snd psmouse sg shpchp soundcore lpc_ich serio_raw i2c_i801 pcspkr mfd_core tpm_tis tpm battery dw_dmac video i2c_designware_platform dw_dmac_core i2c_designware_core acpi_pad processor button ext4 crc16 mbcache jbd2 dm_mod sd_mod ahci libahci libata e1000e scsi_mod ptp pps_core ehci_pci xhci_pci ehci_hcd xhci_hcd thermal fan thermal_sys sdhci_acpi sdhci mmc_core i2c_hid hid [last unloaded: rc_core] > [ 177.091632] CPU: 1 PID: 18040 Comm: rmmod Tainted: G W 4.2.0-rc2+ #9 > [ 177.091648] Hardware name: \xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff \xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff/NUC5i7RYB, BIOS RYBDWi35.86A.0246.2015.0309.1355 03/09/2015 > [ 177.091677] task: ffff88040811b080 ti: ffff880036b88000 task.ti: ffff880036b88000 > [ 177.091693] RIP: 0010:[<ffffffff810aecc3>] [<ffffffff810aecc3>] native_queued_spin_lock_slowpath+0x103/0x180 > [ 177.091718] RSP: 0018:ffff880036b8bcd8 EFLAGS: 00010202 > [ 177.091730] RAX: 0000000000003ffe RBX: ffff880407e11b70 RCX: ffff88041ec962c0 > [ 177.091745] RDX: 7463656a62506357 RSI: 0000000000080000 RDI: ffff880407e11b74 > [ 177.091760] RBP: ffff880407e11b74 R08: 0000000000000001 R09: ffffffff812bf4e0 > [ 177.091776] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88040811b080 > [ 177.091791] R13: ffff88003601cec8 R14: ffff8804084b8890 R15: ffff8804084b8800 > [ 177.091807] FS: 00007f2f9bab1700(0000) GS:ffff88041ec80000(0000) knlGS:0000000000000000 > [ 177.091824] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 177.091837] CR2: 00007fe8c0f900e0 CR3: 0000000035c47000 CR4: 00000000003407e0 > [ 177.091852] Stack: > [ 177.091857] ffffffff81562e3d ffffffff815613b3 0000000000000000 0000000000000000 > [ 177.091876] ffff88040b6d3240 ffff8804084b8890 ffff880407e11b70 ffff88003601cd30 > [ 177.091895] ffff88003601ce28 ffff88003601cec8 ffff8804084b8890 ffffffff8156148b > [ 177.091914] Call Trace: > [ 177.091923] [<ffffffff81562e3d>] ? _raw_spin_lock+0x1d/0x20 > [ 177.091936] [<ffffffff815613b3>] ? __mutex_lock_slowpath+0x43/0x100 > [ 177.091951] [<ffffffff8156148b>] ? mutex_lock+0x1b/0x30 > [ 177.091965] [<ffffffffa028480d>] ? media_remove_intf_links+0x1d/0x40 [media] > [ 177.091981] [<ffffffffa028483e>] ? media_devnode_remove+0xe/0x20 [media] > [ 177.091997] [<ffffffffa063d875>] ? v4l2_device_release+0x95/0x100 [videodev] > [ 177.092014] [<ffffffff813ca19d>] ? device_release+0x2d/0x90 > [ 177.092028] [<ffffffff812be5e9>] ? kobject_release+0x79/0x1b0 > [ 177.092042] [<ffffffffa07b19ea>] ? au0828_analog_unregister+0x2a/0x60 [au0828] > [ 177.092059] [<ffffffffa07ac10e>] ? au0828_usb_disconnect+0x9e/0xd0 [au0828] > [ 177.092075] [<ffffffff8140e609>] ? usb_unbind_interface+0x79/0x270 > [ 177.092090] [<ffffffff813cf285>] ? __device_release_driver+0x95/0x130 > [ 177.092105] [<ffffffff813cf41b>] ? driver_detach+0xab/0xb0 > [ 177.092120] [<ffffffff813ce4c5>] ? bus_remove_driver+0x55/0xd0 > [ 177.092134] [<ffffffff8140d951>] ? usb_deregister+0x71/0xc0 > [ 177.092148] [<ffffffff810e438a>] ? SyS_delete_module+0x1aa/0x250 > [ 177.092163] [<ffffffff81088ee9>] ? task_work_run+0x89/0xc0 > [ 177.092176] [<ffffffff815631f2>] ? entry_SYSCALL_64_fastpath+0x16/0x75 > [ 177.092191] Code: 87 47 02 c1 e0 10 85 c0 74 38 48 89 c2 c1 e8 12 48 c1 ea 0c 83 e8 01 83 e2 30 48 98 48 81 c2 c0 62 01 00 48 03 14 c5 c0 62 90 81 <48> 89 0a 8b 41 08 85 c0 75 0d f3 90 8b 41 08 85 c0 74 f7 eb 02 > [ 177.092281] RIP [<ffffffff810aecc3>] native_queued_spin_lock_slowpath+0x103/0x180 > [ 177.092299] RSP <ffff880036b8bcd8> > [ 177.097721] ---[ end trace b12d5a66f4c6f1c1 ]--- > [ 177.243899] lirc_dev: module unloaded > > Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx> > > diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c > index 7f645bcb7463..e28cabe65934 100644 > --- a/drivers/media/usb/au0828/au0828-core.c > +++ b/drivers/media/usb/au0828/au0828-core.c > @@ -175,8 +175,6 @@ static void au0828_usb_disconnect(struct usb_interface *interface) > */ > dev->dev_state = DEV_DISCONNECTED; > > - au0828_unregister_media_device(dev); > - > au0828_rc_unregister(dev); > /* Digital TV */ > au0828_dvb_unregister(dev); > @@ -193,6 +191,8 @@ static void au0828_usb_disconnect(struct usb_interface *interface) > return; > } > #endif > + au0828_unregister_media_device(dev); > + > au0828_usb_release(dev); > } > > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
